.d-flex {
    display: flex;
}
.flex-1 {
    flex: 1;
}
.column {
    flex-direction: column;
}
.wrap {
     flex-wrap: wrap;
}
.flex-end {
    justify-content: flex-end
}
.space-between {
    justify-content: space-between;
}
.space-center {
    justify-content: center;
}
.space-evenly {
    justify-content: space-evenly;
}
.space-around {
    justify-content: space-around;
}
.top {
    align-items: flex-start;
}
.bottom {
    align-items: flex-end;
}
.middle {
    align-items: center;
}
.ellipsis {
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box; //将对象作为弹性伸缩盒子模型显示。
    -webkit-box-orient: vertical; //从上到下垂直排列子元素（设置伸缩盒子的子元素排列方式）
    -webkit-line-clamp: 2; //想显示多少行就给多大值
}